Mayim Bialik, Alyssa Milano and more child stars who stuck around

Before Brit was arguably the biggest pop star on the planet, she was a 12-year-old Mouseketeer in the '90s revival of "The Mickey Mouse Club." It took five years after the series was canceled for Britney to release her debut album, "...Baby One More Time," and the rest is history! Nowadays, Britney is getting ready for her big Vegas residency and spending quality time with her boys, Sean and Jayden.